Malicious PDF — malware analysis report

Static analysis result for SHA-256 028539f16caeffe0…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 22:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ba93198349f955886d26a5e0b05d43a SHA-1: 6eab3cc5b7c8d28f453ca9261a08f5d9a49a934f SHA-256: 028539f16caeffe040b504ea29a33763c969ab4eb7796a2963fad3ed097fcf22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the compromised hosting, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=things+that+start+with+the+letter+n
    • https://noithatkuongthinh.com/uploads/files/subidekuludat.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37dcb8eac---85853980536.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e27c34410---zowotafutizokizet.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/97ecaf965582f2dbf1b4de400c5e3553/80225792888.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5209ff0449cd1f520fc72534a82620bc/wopalapefo.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b210b858762---zerevef.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b335f97b---83321369350.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0edc0517---19278313734.pdf
    • http://premium-t.info/files/files/losozitomagom.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/b1525249c35c29e5bfd508ee744495d0/29168210620.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/90150b5ed1b0e4a141fdadbf9663fa2a/xalowigapeporexokapi.pdf
    • http://drivescuolaguida.it/userfiles/files/83799862196.pdf
    • https://grupo-kayros.com/userfiles/file/gowobu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e17d174b6---62985822116.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/vejupakifawejirata.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8f8fee683b261aa3e7ebfadf8a7dddb1/68902664404.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc5555d8e---34750953416.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082160dc0161---xogaruxerirekawabemo.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba04cc909e2---53764209674.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78896056847.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160944447970e7---8494625344.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c9ae16f248f1a251794290cc82308b42/73560907544.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2mkvo1dprhcvpsjd2u2jbhg2b3/bifonepojunefup.pdf
    • http://aldo-ins.com/userfiles/file/31005267596.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e702.bin
d767150eb5ef9682eddde4351e484bed6fbc0ba819351a46cfa0a0aecad2d89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 17976 bytes
font_01_sfnt_off000114a2.bin
e67faea7550f20a257596b564cead142328cf7520e736443331a9680aea80bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10316 bytes
font_02_sfnt_off00012be4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 16792 bytes

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